Die casting machine



Oct. 27, 1953 w. H. SCHWARTZ 2,656,576

DIE CASTING MACHINE Filed Aug. 17, 1950 3 Sheets-Sheet l IN V EN TOR.

7 MILL/AM H.5CHW'AR7Z GTTOQNEVSY.

3 Sheets-Sheet 2 Oct. 27, 1953 w. H. SCHWARTZ DIE CASTING MACHINE Filed Aug. 17, 1950 INVENTOR.

A rro rgmrva a .n n u m m 9 w WILL/AM H. SCHWARTZ W AMYM 4;

Oct. 27, 1953 w. H. SCHWARTZ 2,656,576

' DIE CASTING MACHINE Filed Aug. 17, 1950 5 Sheets-Sheet 3 IN VENTOR.

WILLIAM H.5CH W6 RTZ 3V 0W YWQL Patented Oct. 27, 1953 DIE CASTING MACHINE William .H. Schwartz, Cleveland, Ohio, assig'nor to Lester Engineering Company, Cleveland, 0hio,.a corporation of Ohio 1 Application August 17, 1950,5erlalNo. 179,961

7 Claims.

1 The present invention, while relating generally as indicated to improvements in a die casting machine, is more particularly concerned with improvements in the goosenecl: and nozzle con struction and mounting thereof on the machine.

It is one principal object of this inventionto provide in a die casting machine, a gooseneck assembly in which the goosenecl: is slidably mounted in a sub-frame or yoke rigid with the machine frame "for making possible the convenient clamping of the discharge nozzle of the machine between the gooseneck and the die block and for facilitating the removal of the goosene'c'k from the yoke for servicing thereof or for providing access to the nozzle.

Another object of this invention is to provide a novel guiding and supporting means for the discharge plunger of the gooseneck assembly which assures accurate alignment between the plunger and the cylinder bore in which said plunger reciprocates.

Anotherobject of this invention .is to provide a unique separable coupling connection between the discharge plunger and the actuating piston therefor.

Another object of this invention is to provide a gooseneck unit which is entirely "independent of the'furnace and the melting pot therein.

Another object is to provide a simple adjustment for locking the goosenecl: and nozzle against the die rigidly while permitting rapid unlocking "for removal of the gooseneck; also replacement of the nozzle.

Another object of this invention is to provide an electrically heated, pyrometrically controlled, nozzle clamped between the gooseneok and the die blo'c'k of a form such that the nozzle itself is a't' all times inintimate heat conducting relation with a surroundingheating element where-' by to assure a maximum transfer of heat from the element to the nozzle.

Otherobjectsand advantages of my invention will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, said invention then comprises the features hereinafter fully described and particularly pointed out in "the-claims, the following description and the annexed drawing setting forth in detail one illustrative embodiment of the invention, this being indicative, however, of but one of the various ways in which the principle of the invention may be employed.

In :said annexed drawings:

Fig. ":1 is a vertical cross section view of the furnace end of a die casting machine illustrating 2 the gooseneck and :nozzle constituting the present invention;

Fig. .2 is a "vertical cross section view taken substantially along the line .'22, Fig. 1:;

.Fig. .3 is .a 'top plan view partly in section,.:such section having :been :taken along the line 5-13, Fig. 2; and

Fig. 4 is a across-sectional view taken substantially. along .the line 4-4, :1.

Referring now more specifically to tiierdrawings, the reference numeral I indicates the main frame of the die casting machine adjacent one end of which the furnace I2 is adapted itO rbe positioned, the upper end "only of the furnace being shown in the drawings, and if desired,

said iurnace may have casters 01 thelike thereon to enable convenient transportation ithererif from one machine to another.

l Supported in said furnace 2 is .a .melting ;pot:t8 which includes a generally cup-shaped reservoir 4 for molten metal and into which metal billets are adapted to be :loaded for :melting and .a shallower :and narrower extension 5 disposed closely adjacent "the end of the machine frame. The shaping of the melting zpOt as indicated to :zprovide a relatively :deep cup-"shaped rpontion 4 and with 1a relatively narrow and shallow radially projecting extension :portion 15 enables .the melting .of a relatively large volume of :metal and periodical loading of the melting pot with billets withoutipossibility of damage to the-gooseneck immersed in the :metal and without ap preciably reducing the temperature of the molten metal around said 'gooseneck. This construction of melting pot :also "prevents the :expansion of the metal during the melting .from imposing strains on the gooseneck.

Securely bolted to the machine :frame l abetween suitable :spaced extensions 6 thereof :as by"meansaof bolts 1 is .ayoke 8 which is formed with downwardly'dependingxlegs .9:I9, .said legs being 'formed with opposed longitudinally extending guideways l20 Mldisposed directly above the :narrow -;and shallow ::por'.tion:.5 of the -melting pot 3. Said yoke 8 may further be provided with ;a diagonal :brace ill and other braces i2 bolted-as at Mito the machine frame I .for imparting vertical and lateral :rigidity :to said yoke Horizontally sli'dably :mounted in the guideways xiii-t0 :in said yoke 8 is a gooseneck ii which includes oppositely-extending"rib likeportions 16 slidably fitting in such guideways. Said gooseneck extends downwardly *into the narrow and shallow "portion 5 of said melting pct 3 and such lower portion is formed with a vertically-disposed bore it formed in the liner [8 of suitable material in said gooseneok and a passageway l9 leading from the lower of the bore I; and curving upwardly and toward the machine frame I, the upper end of such passage terminating in a duct having a spherical end portion 29 to fit within a corresponding spherical socket in the outer end of a discharge nozzle 2i. Laterally through the lower portion of said gooseneclr l and liner i8 and above the lower end of bore ll is an inlet opening 23 through which molten metal from pot 3 may run into such bore I? and into the curved passage- 7 way [9.

The nozzle iii just referred to has a spherical discharge end 2 3 which is adapted to be fitted into a complementary socket formed in the adjacent one of a pair of separable die blocks, not shown, into registry with a sprue passage in said block which leads to the die cavity formed'between separable die blocks. The nozzle 2i is provided with a passage 25 axially therethrough through which molten metal is adapted to be forced from the bore ii and passage is in gooseneck is into the cavity formed between the separable die blocks. Said nozzle has a tapered outer surface 25: throughout its length which is wedged into the correspondingly tapered bore 2. of the tubular body 29 in which an electric heating'element 28 is disposed. By so'wedging said nozzle 2| into the tubular body 29, the resultin expan sion of said body 29 will preclude formation of an air gap between said nozzle and body at ele- Because of the tapered vated temperatures. Wedge fit of the nozzle 2i in body it and initial stressing of said body member, the subsequent heating of the nozzle and body by current flow through element 28 will only relieve or partially relieve such stress in said body whereby said nozzle 2| and body 29 will at all times remain in intimate heat conducting relation.

Clamping of said gooseneck in operating position with nozzle 2i clamped between said gooseneck and the adjacent die block is elfected as by means of a pair of screws lit-+39 which are carried in a bracket 3! mounted on the frame extensions t and have inner swivelled ends 33 bearing against the outer end face of said gooseneck 15. In turn, said bracket 3i is bifurcated at its opposite ends as at 532 and pins 33 pass therethrough and through cars 32': extending into the bifurcated ends; said cars 35 being formed as on the outer ends of the frame extensions i5 whereby, when it is desired to remove said gooseneck I5 for servicing the same or for replacing the same or for servicing the nozzle it, one of said pins 3 may yoke;

The upper end of said gooseneck I5 is provided with a split guide unit 35 in which a portion of a discharge plunger 3'5 is slide guided, the lower end portion of said plunger 3'? being closely fitted into the vertically disposed bore il' whereupon, during the downward movement of said plunger, molten metal will be forced from the bore I! through the'curved passage l9 and through the nozzle passage 25 into the die cavity and, of course, upon raising the plunger to expose the lateral opening 23, the molten metal from within the melting pot 3 will run through such lateral opening to fill the space beneath the bottom end of said plunger 3?. It is to be noted that the guide bushing 38 in said split guide unit 36 is also of a split form. Said guide unit 3% comprises a half-section 39 carrying the bushing half-section 48, said section 39 being formed with openings fitting over upward extensions of screws 4! in said gooseneck 55. The other half-section 52 of said unit 35 carrying the other bushing halfsection it is pivotally connected to section 39' at one side by means of a vertical pivot 44 and the other sides of sections 39 and 32 are releasably held together by a swing bolt id carried for vertical pivoting on section 39 and having a nut 46 engaging section s2.

Thus, it is apparent that by loosening the nut 46 on said swing bolt 35 the latter may be swung about its vertical pivot out of engagement with section 42 whereby said section 42 and the bushing section 43 carried thereby may be swung outwardly to release said discharge plunger 3'! to enable transverse movement thereof with respect to the machine frame i and also with respect to gooseneck 15 upon raising of said plunger sufiiciently to withdraw the lower end portion from bore ll.

The upper plunger 3? is formed with a collar or flange 4! which fits into a transverse Tslot 48 across the lower end of a split coupling 49, such T-slot extending in a direction parallel to the guideways 56 formed in said yoke 8. Such coupling 49 is connected to the lower end of the piston rod 59 of a hydraulic actuating cylinder 5|, the latter being bolted directly to the upper end of said yoke 8. Said connection between said piston rod a 5d said coupling 46 comprises a head 52 on said piston rod fitting in a complementaryrecess in said coupling. Said coupling 49 is of the split type including two half sections 53 and 54, each pivotally connected at one side to a vertically disposed rod 5 3 depending downwardly from the upper end of said yoke 8 and one section 53 has, on its other side, a swing bolt 5'! with a nut 58 thereon which is engageable and disengageable with a bifurcated car 59 extending from the other side of the other section 54. Here again, upon loosening of the nut 58 on said swing bolt 51,

said bolt may be swung out of engagement with the bifurcated ear 59 whereby the two sections 53 and 54 may be'swung open to disengage the same from the head 52 attached to the piston rod 59.

A further feature of this invention is that when the piston 60 which is connected to the upper end of rod 5% and which is reciprocable in cylinder!" is in its elevated position as shown in Fig. 1, the

8 and the plunger disengaged. from the closed coupling 49. l r

The hydraulic actuating cylinder 5| is of a conventional form including a suitable packing (ii at the lower end through which the piston rod end portion of 7 said discharge 7 waive :through .tthe iintermediary of the usual clamping nutz 68 which: clamps fthe flared ='e1id nof ,athe ttube :against a a :conical: seat iformed -i-n itheavalve .-.body. iThHS, when- 'fluid -under pres- --sure..is admitted intcrthe -tube =61, the-valve memzber 69 is- .unseate'd, :overcoming spring I 1:0,and

- the fiuidgfreely fiowsiinto the" upper en'd cf said .tcylin'derffi I: thereby 'cforcing said piston fio downswardlytand through thecoupling l9 forcing the Jdischarge plunger 3! downwardlyto ffectdiseel-large of molten metal fromathe gooseneck W5 .=and-:.throughnozzle- 2 ll into the diecavity. rne fluidsidisplaced from the lower end of said cylinder 5| is returned -to a suitablereservoir through rthe ntubei 'H connected to theport -82 as by the Ffitting 12v andI-having therein a suitable' throttle :valve I3 operated by the=lever'14. Ofcourse, the ttubesifil andi'll will be connected to arsuitable four-way reversing valve (not shown) orthe-like lsothat when it isdesired toraise"the piston 60 :and thus the: discharge plunger 31 through *the :split coupling 49, -fiuid under pressure admitted into the tube -will :forcesaidpiston ell-upiwardlysto raise said'discharge plunger 31, the 'sfluidfdisplaced from the upper end of said-:cylinder 5| ,nowapassingwhrough the-orifice 15in" the seated v valve :member 69 =and through the *tube 61 iinto a suitable reservoir, not: showm the :size of xthe orifice'wcontrolling the rate of upward movement of said piston 60 to keep such movement within desired limits.

In maryxitzcamnow'he sccnilthat the present construction is of a verysirnple form providing accurate guiding of saidsdischarge 1plunger .31 and enabling servicing and replacement thereoflindependently of the gooseneck l5land prosliding for-accurate positionin .ofsaid ,sooseneck ,liyvith respect to said discharge nozzle 2L and through which firm clampinghof the gnozzle Zl ,between ,the die block andlthegoosenecmlfivmay bereadilyaccomplished. lilnla'ddition, said seoseits supporting yoke 8. Moreover, said gooseneck l [5 is disposed to one side of said melting pot 3 whereby there is no danger of damage to the same when loading metal billets into the melting pot and in so loading the melting pot only the molten metal will ever be in contact with the gooseneck whereby the same is not subjected to wide variations in temperature and is not subjected to any strains incident to the loading of the melting pot with the billets.

A still further notable feature of the present construction is that the transversely slidable connection of the rod 59 and said plunger 31 enables free reciprocation of the latter without locking strains on the gooseneck and plunger even though the rod and plunger are misaligned 16 -.apti'=to: occursbyr'reasonsot wariationlsim the -operativezpqsitiomofztha gooseneckfidueito variaction in='therlengthhithemozzl 2 laand variaitlon iiln ".zthe ldistance aroma-Ether axis :zof there #1 1 mo -spherica1eportion 12 Briton-example.

lisflill another.importantifeature isftheiapplieaetion :of eclamping 1 force on said gooseneck nby rescrewsim-which areidirectlytsopposed to the nozrzlee! I stherebyielirninating eccentricuforces orr said .gooseneck. 'a'Ihe .properssettingrzof theseascrews 33W issa. simplesmatter, and'ris'athemnly adjustmentxthatrrequires .tobe made by the operator .q inzsettingup the: machine.

' rwhilerzasziillustrawd iandfldescribedf above the .-1 gooseneck l 5:andvguideiunit 2 36- are; made' -up to! cseveral::parts,-: it. shouldnbes: explained thatiitmsris :merelyrtot facilitate the manufacture of the comfipleteaa-ssembly. 3 In other words, from2.'the-1operaillille standpoint such goosenec'k and guideinnit are :toi be: consi'derediasl in lefffict tintegraL therplunger rfiibeingiheld lsecurely'improper alignment; irresspectiver of the: removal 1 and 'replacementrzof tthe assembly in the gu ideways |:0-l 0.

"The itoregoing vconstruction knot only insures '=:the:proper. mountingiof .the gooseneck assembly in the machineysince this oan be accomplished in onlycone way; butualso the-proper alignment .of i thezoperating :partstinlsuch assemblyi isfateall timesl assured.

i Otherrmodes: of r applyin'g therprinciple wif i the "invention mayibe employed; :change' beingi made as regards ithe .adetails described, :provided the features stated in any-ofithe lfollowing claims or athe equivalent .of such rbesemployed.

Iatherefore, particularly pointcout and distinctly claim as my invention:

' 1.1 In a die casting machine, 'the comblnation 10f a frame; meansa:djacentrone end-ofsaid-frame :providing a passageway formolten metaL-"a yoke with:f-downwardly-ldepending I legs inxedly secured *lto 'suchaone endr of said' frame, asgooseneck slidably carried: by said -yoke for "movement-toward :and away: from said rmeans in-to and out-oft eniigagementrtherewith said: gooseneclr being formeid zwithkanilupwardly:"opening-bore adapted to contaimmolterr metaband with a passage communicating asuch' bore with the 'passageway in said means when said 'gooseneck is 'in position en'gag- .aingc said means-"a clamp 'device' movable with re- *spect to said yoke :and framein 1 the direction of fisl-iding dt asaid gooseneck into engagement-with *said :gooscneck .=at :a *point substantially aligned :withmaidmeans to retain the gooseneck impositi-on engaged with said means and out o! -=en- *gagementrzwith go'oseneck to permit moveunent of the latter awayyfrom and sout 'df lmgagement :with said means, an -upwardly aexten'di-ng plunger recipro'cable in such bore "for displacing molten 1 metal therein through such massage *and passageway: an actuatorfonsaid plunger-mounted on said yoke, and a coupling between said plunger and actuator, said coupling having a transversely slidable and detachable connection with said plunger whereby said gooseneck with said plunger therein may be moved toward and away from said means upon manipulation of said clamp device.

2. A gooseneck assembly for the furnace and melting pot end of a die casting machine comprising a yoke formed with downwardly depending legs and adapted for mounting in fixed position above such pot, a gooseneck depending from such yoke for immersion in molten metal in such pot and having a transversely slidable connection with such legs and formed with an upwardpermit transverse withdrawal of said plunger.

3. A gooseneck assembly for the furnace and melting pot end of a die casting machine comprising a yoke formed with downwardly opening legs and adapted for mounting in fixed position above such pot, a gooseneck depending from such yoke for immersion in molten metal in such pot and having a transversely slidable connection with such legs and formed with an upwardly opening bore extending upwardly between such legsladapted to receive molten metal from the pot and with a discharge passage leading from such bore to an outlet transverse to the path of sliding of said gooseneck, a plunger vertically reciprocable in such ,boreand extending upwardly between such legs, a hydraulic cylinder fixedly mounted on the upper end of said yoke, a piston vertically reciprocable in said cylinder and having a piston rod extending downwardly between such legs, and means providing a transversely slidable connection between said piston rod and plunger whereby said plunger and gooseneck may be transversely moved between such legs with respect to said piston rod.

4. A gooseneck assembly for the furnace and melting pot end of a die casting machine com prising a yoke formed with downwardly depending legs and adapted for mounting in fixed position above such pot, a gooseneck depending from such yoke for immersion in molten metal in such pot and having a transversely slidable connection 1 with such legs and formed withan upwardly opening bore extending upwardly between such legs adapted to receive molten metal from the pot and with a discharge passage leading from such bore to an outlet transverse to the path of sliding of said gooseneck, a plunger vertically reciprocable in such bore and extending upwardly between such legs, a hydraulic cylinder fixedly mounted on the upper end of said yoke, a piston vertically reciprocable in said cylinder and having arpiston rod extending downwardly between such legs, and means providing a transversely slidable connection between said piston rod and plunger whereby said plunger and gooseneck may be transversely moved between such'legs with respect to said piston rod, said last-named means comprising a coupling secured to said piston rod and formed with a transverse T-slot, and said' plunger being formed with a collar portion transversely movably fitting into such slot.

5. In a die casting machine, the combination of a frame, means providing a pasageway for molten metal, a yoke fixedly secured to said frame, a gooseneck slidably carried by said yoke for movement toward and away from said means into and out of engagement therewith, said gooseneck being formed with a chamber adapted to contain molten metal and with a passageway communicating such chamber with the passageway in said means when said gooseneck is in position engaging said means, releasable clamping means bearing on said gooseneck to retain the latter in position engaged with said means, a plunger reciprocable in said gooseneck to displace molten metal from such chamber through such passageways, plunger actuating means in cluding a cylinder mounted in fixed position with respect to said frame and said yoke and a piston reciprocable in said cylinder, and a coupling securing said piston and plunger together whereby the latter is reciprocated by the former, said coupling having a transversely slidable connection between said plunger and said piston to assure free reciprocation of said piston in said cylinder and of said plunger in said gooseneck in the event of misalignment of said piston and said plunger when said gooseneck is clamped in position engaging said first-named means.

6. The die-casting machine according to claim 5 characterized further in that said plunger is transversely detachable from said coupling whereby said gooseneck and plunger may be withdrawn as a unit from said yoke.

7. The die-casting machine according to claim 6 characterized further in that said gooseneck is provided with a split guide for said plunger of which guide a portion is integrally formed with said gooseneck for insuring accurate guiding of said plunger relative to said gooseneck and for enabling transverse disassembly of said plunger from said gooseneck and from said coupling without first removing said gooseneck from said yoke.

. WM. H. SCHWARTZ.

References Cited in the file of this patent UNITED STATES PATENTS I Number Name Date 7 1,948,992 Morin Feb. 2'7, 1934 1,975,966 Morin et al Oct. 9, 1934 2,103,438 Schultz Dec. 28, 1937 2,131,955 Johnson Oct. 4, 1938 2,173,377 Schultz et al. Sept. 19, 1939 2,224,978 Morin Dec. 17, 1940 2,334,372 Abbott et al Nov. 16, 1943 2,393,588 Cherry et al. Jan. 29, 1946 2,485,526 Bennett Oct. 18, 1949- 2,522,866 Gash Sept. 19, 1950 

